Weight loss jabs work. The question is access.
If you live in the UK and you've watched friends, colleagues, or that one cousin shrink in front of your eyes over the last year, you already know what this article is about. Mounjaro and Wegovy. The Boots Online Doctor adverts. The Numan and Voy logos popping up on your Instagram feed. The chemist shelf that now stocks needle disposal bins next to the paracetamol.
The skinny jabs are real. They work. Roughly 1.6 million people in the UK are now using them, most via private prescription. The NHS pathway exists, but it's narrow and slow, and most people end up paying out of pocket somewhere between £130 and £375 a month.
This guide walks you through every option a UK adult has in 2026, who qualifies on the NHS, what the private route actually costs at Numan, Voy, Boots, LloydsPharmacy and Manual, and how to get a prescription without falling into the dodgy fake-pen trap that's been hospitalising people.
🔑 Key Takeaways
- The category in the UK means two drugs: Mounjaro (tirzepatide) and Wegovy (semaglutide). Saxenda is the older daily option.
- NHS access exists but is rationed. Mounjaro through GPs requires BMI 40+ and four weight-related conditions during the current rollout phase.
- Private prescriptions need BMI 30+ (or 27.5+ with a comorbidity). All legitimate UK providers now require a video consultation or NHS record check.
- Mounjaro pens cost around £149 starter, rising to £300 to £375 for the 15mg maintenance dose. Wegovy starts near £130 and caps near £295.
- Numan, Voy, Boots Online Doctor, LloydsPharmacy and Manual are the five biggest legitimate UK providers. Avoid anything offering a month for under £150.
- People typically start losing weight in the first two to four weeks. Expect 15% to 22% body weight reduction over a year on the right dose.
- Common side effects: nausea, constipation, diarrhoea. Rare but serious: pancreatitis. Stop and see your GP if you get severe stomach pain.
Telehealth Comparison Table
UK readers should start with the providers below in the Private UK section. The two telehealth options listed here are US-based and ship within the United States only, included for readers searching from the US.
What Are Weight Loss Jabs?
One injection a week. Roughly the size of an EpiPen.
The drugs are a class of GLP-1 receptor agonist originally developed for type 2 diabetes. They mimic a gut hormone called glucagon-like peptide-1, which slows gastric emptying, blunts hunger, and steadies blood sugar. The result, in plain language, is that food stops being on your mind every 90 minutes. Portions shrink without thinking about it. The constant snacking impulse fades.
UK newspapers nicknamed them fat jabs and skinny jabs when celebrity use spilled into mainstream coverage in 2023. Doctors prefer "GLP-1 injections" or "weight management injections", but the public knows them as weight loss jabs and that's the term most pharmacies now use on their pages too.
The pen is self-administered subcutaneously into the stomach, thigh, or upper arm. Once a week, same day each week, no fasting required. Most people start on a low dose and titrate up every four weeks until side effects plateau or the target dose is reached.
Which Weight Loss Jabs Are Available in the UK?
Three are licensed. Two dominate.
The licensed options in the UK are:
- Mounjaro (tirzepatide) by Eli Lilly. The newest, most effective, and currently the most prescribed.
- Wegovy (semaglutide) by Novo Nordisk. Same active ingredient as Ozempic, higher dose, licensed for weight management.
- Saxenda (liraglutide) by Novo Nordisk. The older daily injection. Largely replaced by the weekly options.
Ozempic itself is licensed only for type 2 diabetes in the UK and should not be prescribed for weight loss. If a private clinic offers Ozempic for slimming, that's a regulatory red flag.
Retatrutide, which has appeared in research news, is not approved anywhere yet. Anything sold online claiming to be retatrutide for weight loss is unlicensed. The Which? investigation in 2025 found counterfeit retatrutide being sold by criminal sellers, sometimes containing insulin. Read the proper retatrutide guide here if you want the science.
Mounjaro vs Wegovy in the UK
The two drugs are not equal.
Tirzepatide (Mounjaro) is a dual GIP/GLP-1 agonist, meaning it acts on two gut hormone receptors instead of one. Wegovy is a single GLP-1 agonist. In head-to-head trials, tirzepatide produced about 22% body weight reduction at the highest dose over 72 weeks, compared to roughly 15% for semaglutide.
That extra 7 percentage points is why Mounjaro has overtaken Wegovy in private prescription volume since 2025.
| Feature | Mounjaro (tirzepatide) | Wegovy (semaglutide) |
|---|---|---|
| Mechanism | Dual GIP/GLP-1 | GLP-1 only |
| Average weight loss | ~22% over 72 weeks | ~15% over 68 weeks |
| Doses (weekly) | 2.5, 5, 7.5, 10, 12.5, 15mg | 0.25, 0.5, 1, 1.7, 2.4mg |
| Private starter price | ~£149/mo (2.5mg) | ~£130/mo |
| Private maintenance | £300 to £375/mo (15mg) | ~£295/mo (2.4mg) |
| NHS GP route | Yes (BMI 40+, 4 conditions) | Specialist clinic only |
For a deeper comparison see Wegovy vs Mounjaro.
Weight Loss Jabs on the NHS
Eligibility is tighter than most people expect.
The NHS pathway exists, but the criteria are narrow and the waiting times are real. Here's what each drug requires as of 2026.
NHS Mounjaro eligibility (GP route, current rollout phase)
- BMI of 40 or more (37.5 for some minority ethnic backgrounds)
- Four or more weight-related health conditions, such as type 2 diabetes, hypertension, dyslipidaemia, obstructive sleep apnoea, or cardiovascular disease
- Access through your GP, with wraparound dietary and physical activity support
The NHS expects roughly 3.4 million adults to eventually qualify, but full rollout is a 12-year plan starting from June 2025. NICE will review at year three.
NHS Wegovy eligibility (Specialist Weight Management Service)
- BMI of 35 or more, plus at least one weight-related health condition
- OR BMI of 30 to 34.9 (27.5 to 32.4 for certain ethnic backgrounds) plus referral to SWMS
- Maximum two-year course via specialist clinic only
- Standard NHS prescription charge (£9.90), or free if you qualify for exemption
If your GP refuses the prescription and you believe you qualify, ask for a referral to your local Specialist Weight Management Service or check with your Integrated Care Board. Eligibility can vary by ICB postcode.
Private Weight Loss Jabs UK
Most people pay privately.
The private route has a lower BMI threshold (30+, or 27.5+ with a comorbidity), no waiting list, and a typical first prescription within 48 hours. Since 2025, the General Pharmaceutical Council requires every legitimate provider to verify identity and BMI through a video consultation or NHS record access. A questionnaire alone is no longer legal.
Numan
Numan is the UK telehealth provider that built its name on men's health and now runs one of the larger Mounjaro programmes in the country. Strong app, weekly check-ins, registered UK pharmacy, and free needles included. Mounjaro starter dose typically £149, rising with titration. Wegovy from around £159.
Voy (formerly Manual)
Voy is the rebranded weight loss arm of Manual. They offer both Mounjaro and Wegovy, with a coaching layer built in. Pricing sits in the middle of the market, around £179 for the Mounjaro starter and £225 for Wegovy 1.7mg. Includes a 12-week coaching programme as part of the subscription.
Boots Online Doctor
The Boots Online Doctor service is the trusted high-street option. Slightly higher prices than online-only competitors, but you can collect from a Boots pharmacy, which some patients prefer to courier delivery. Mounjaro from £169, Wegovy from £159. Fully MHRA-compliant video consultation included.
LloydsPharmacy Online Doctor
Similar to Boots, with the LloydsDirect chemist network behind it. Pricing competitive at around £159 for Mounjaro 2.5mg. Includes follow-up consultations and the option to pause the prescription if side effects need a dose hold.
Manual
The original Manual brand still operates a weight loss line alongside the Voy spinoff. Pricing tracks closely to Voy. Worth comparing the two side by side because promotional discounts vary month to month.
UK Cost Comparison
Prices change quarterly. The table below is current to May 2026.
| Provider | Mounjaro starter (2.5mg) | Mounjaro maintenance (15mg) | Wegovy 1.7mg | Consultation |
|---|---|---|---|---|
| Numan | £149 | £319 | £199 | Video, included |
| Voy | £179 | £339 | £225 | Video, included |
| Boots Online Doctor | £169 | £329 | £189 | Video, included |
| LloydsPharmacy | £159 | £309 | £199 | Video, included |
| Manual | £169 | £329 | £209 | Video, included |
| Superdrug | £169 | £329 | £199 | Video, included |
| NHS | £9.90 (Rx charge) | £9.90 | £9.90 | GP/SWMS referral |
Anything below £150 a month for Mounjaro is a counterfeit warning sign. The wholesale cost of high-dose tirzepatide is roughly £247.50, so a legitimate retailer cannot sustainably sell below that for the maintenance dose. Several deaths and hospitalisations in the UK during 2024 and 2025 traced back to fake pens sold under the £150 line.
Side Effects
Most people get something. Most of it passes.
About one in ten people on these injections experience the common side effects: nausea, vomiting, constipation, diarrhoea, stomach pain, heartburn, and headache. These usually peak in the first two to four weeks of each dose increase, then settle. Eating smaller meals, avoiding very fatty food, and staying hydrated genuinely helps.
Less common but serious side effects include:
- Pancreatitis. Severe, persistent stomach pain that radiates to the back. Stop the jab and see a GP same-day.
- Gallstones. More likely if you lose weight quickly.
- Kidney problems. Usually linked to dehydration from vomiting.
- Worsening diabetic retinopathy in people with existing eye disease.
- Mood changes. Rare, but reported.
If you're using fat jabs and you find yourself unable to keep fluids down for more than 24 hours, that's an A&E call, not a wait-and-see. Several UK consultants have flagged increasing presentations of dehydration-driven kidney injury in patients self-managing through side effect spikes.
How to Get Weight Loss Jabs UK
Five steps, in order.
- Check your BMI. Use the NHS BMI calculator. Private prescription needs 30+, or 27.5+ with a related condition. NHS routes need 35+ or 40+ depending on the drug.
- Decide NHS or private. If you meet the strict NHS threshold and you're happy to wait for a referral, ask your GP. Most people don't qualify and go private.
- Pick a provider. Compare Numan, Voy, Boots, LloydsPharmacy, Manual, and Superdrug Online Doctor on price, app quality, and consultation style.
- Complete the video consultation. A registered UK clinician verifies your identity, BMI, medical history, and prescribes. Expect 10 to 15 minutes.
- Receive the pen. Discreet courier delivery within 24 to 72 hours. Store between 2°C and 8°C until first use, then up to 21 days at room temperature.
For the underlying science of how these drugs work, see our telehealth GLP-1 overview and the GLP-1 shots injectable guide.
Frequently Asked Questions
Medical Disclaimer: This article is for informational purposes only and is not medical advice. GLP-1 injections are prescription-only medicines and require assessment by a registered UK clinician. Do not start, stop, or change a GLP-1 prescription without speaking to a qualified healthcare professional. If you experience severe stomach pain, persistent vomiting, or signs of an allergic reaction, contact NHS 111 or attend A&E. Pricing and eligibility information is current at time of writing and may change.